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Fujitsu Conducts Collaborative Field
Testing of LTE
Fujitsu
March 16, 2009
Tokyo & Kawasaki, Japan -- Fujitsu Limited and Fujitsu Laboratories
Limited today announced that, in collaboration with NTT DOCOMO, INC.,
they have conducted successful field testing for Long-term Evolution
(LTE(1)), a core technology standard for high-speed wireless
communications, using 4x4 MIMO(2).
The testing took place in the Special Ubiquitous Zone, an area of the
northern Japanese city of Sapporo in Hokkaido, designated by the
Ministry of Internal Affairs and Communications in 2008 as a wireless
communications testing area, and used prototypes of the wireless LTE
base stations developed jointly by NTT DOCOMO, Fujitsu and Fujitsu
Laboratories which, with the use of MIMO technology, resulted in
high-speed wireless transmissions in the range of 120 Mbps (using 10 MHz
bandwidth) in Sapporo's urban environment. |
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LTE, sometimes referred to as the
3.9G wireless standard, is a standard for wireless communications that
enables broadband communications for mobile phones. It is an
international standard created by the standard-setting organization
3GPP(3) and is intended to produce dramatic improvements in wireless
performance, including faster, higher-capacity data communications,
reduced connection lag times, and more efficient bandwidth frequency
utilization.
Fujitsu and Fujitsu Laboratories were selected by NTT DOCOMO in 2006 to
be the developer and manufacturer of their wireless LTE base stations.
Since then, they have worked together with NTT DOCOMO to develop these
technologies using 4x4 MIMO, which increases speed and capacity in both
transmitting base stations and receiving mobile stations, and the three
companies have performed successful tests of a prototype three-sector
LTE base station that has a transmission capacity of 300 Mbps per sector
on the downlink (20 MHz band).
The field testing involved LTE transmissions using NTT DOCOMO test
stations in Sapporo's urban environment, assessing the throughput
characteristics of 4x4 pre-coding MIMO(4) on the downlink and confirming
that a maximum of 120 Mbps (using 10 MHz bandwidth) could be attained
over a measured course. This would be equivalent to 240 Mbps throughput
using the 20 MHz maximum bandwidth that LTE allows. These tests revealed
that the adaptive switching used in MIMO multiplexing was effective in
achieving stable throughput in outdoor carrier environments.
Through transmission speeds measuring approximately 35 times that of
3.5G (7.2Mbps) and 2.5 times that of fixed optical fiber lines
(100Mbps), wireless LTE transmission of large volumes of data used in
high-definition videos, as well as in business and everyday life, is now
possible.
The results will contribute to Fujitsu's ongoing development of wireless
base stations, as well as core network systems, handset technology, and
the total LTE commercial network.
Partial results from these tests will be presented jointly by Fujitsu,
Fujitsu Laboratories, and NTT DOCOMO at the general meeting of the
Institute of Electronics, Information, and Communications Engineers
(IEICE), on March 17 at Ehime University in Japan.
Glossary & Notes
1 LTE: Long-Term Evolution. The name for the wireless communications
standard devised by members of 3GPP, including Fujitsu and NTT DOCOMO.
2 4x4 MIMO: Multiple-input, multiple-output. MIMO, a core technology
underlying LTE, is a spatial multiplexing technology that uses multiple
antennas transmitting/receiving different signals on the same frequency.
The 4x4 MIMO which employs four antennae at both the transmitting base
stations and receiving mobile station, can dramatically increase
wireless communications speeds without increasing frequency width.
3 3GPP: 3rd Generation Partnership Project. The partnership project that
produced the detailed specification for IMT-2000 W-CDMA.
Standards-setting organizations from around the world developed a common
standard to be used in all nations and regions in the form of the
standard developed under 3GPP. Includes many companies and organizations
as members, including the world's leading mobile carriers.
44 Pre-coding MIMO: The MIMO transmission method adopted as a standard by
3GPP. A technology where the receiving handset sends feedback regarding
its reception characteristics to the wireless base station to optimize
MIMO transmissions.
About Fujitsu
Fujitsu is a leading provider of IT-based business solutions for the
global marketplace. With approximately 160,000 employees supporting
customers in 70 countries, Fujitsu combines a worldwide corps of systems
and services experts with highly reliable computing and communications
products and advanced microelectronics to deliver added value to
customers. Headquartered in Tokyo, Fujitsu Limited (TSE:6702) reported
consolidated revenues of 5.3 trillion yen (US$53 billion) for the fiscal
year ended March 31, 2008. For more information, please see:
www.fujitsu.com.
About Fujitsu Laboratories
Founded in 1968 as a wholly owned subsidiary of Fujitsu Limited, Fujitsu
Laboratories Limited is one of the premier research centers in the
world. With a global network of laboratories in Japan, China, the United
States and Europe, the organization conducts a wide range of basic and
applied research in the areas of Multimedia, Personal Systems, Networks,
Peripherals, Advanced Materials and Electronic Devices. For more
information, please see: http://jp.fujitsu.com/group/labs/en/
All other company or product names mentioned herein are trademarks
or registered trademarks of their respective owners. Information
provided in this press release is accurate at time of publication and is
subject to change without advance notice. |
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